There has been outrage in one NSW community after an underground coal mine was blamed for considerably damaging the nearby environment.

A stream of cement has reportedly been flowing for hundreds of metres down a bush creek in the Sugarloaf State Conservation Area, west of Newcastle.

Conservationists say clearly, efforts to patch-up massive subsistence damage from the Glencore West Wallsend underground coal mine have failed. Questions are now being asked as to who administered the shonky clean-up, and how it was allowed to go so poorly.

Nature Conservation CEO Pepe Clarke says environmental legislation was flagrantly ignored.

“The company was required legally to establish a committee to monitor subsidence, they failed to do that,” Mr Clarke said.

He went on to question the planning department’s ignorance of the predicted subsistence, which is now contaminating significant environmental sites.

“The Department of Planning went ahead regardless and approved this damaging operation,” he added.

Reports say Glencore will now look at fixing the problem, though it will be an incredibly arduous task to redeem the river from its current state.